Collapsible mandrel.



i l narran 'strass ragen wie.

THORVALD HANSEN, OF EVERETT, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO STANDARD FIBRE COMPANY, INCORPORATED, OI SOMERVILLE, MASSACHUSETTS.

COLLA? SIBLE MANDREL.

. drels, of which the following is a full, clear,

and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.A

In the process of manufacturing vulcanized fiber tubes and roving" cans vit is customary to form the crude tube by winding a wet and softened web of suitable fibrous material around a mandrel. During the winding operation the diiierent layers of material are compressed and consolidated into` a homogeneous tube by the action of a heated calen roll pressing toward the mandrel. The heat of this calender roll causes the tube to shrink considerably so that it grips the mandrel sp Atiglltly that it is impossible to remove the tu e unless some means are provided to allow the mandrel to collapse.

My invention relates to a device that overcomes these difliculties by providing means to forcibly draw the segments of the mandrel toward each other, thus freeing th tube at some section of its internal circumfe ence and enabling the remaining portion to be easily separated.

Referring to the drawings-Figure 1 is a longitudinal sectional view of a mandrel embodying my invention. Fig. 2 is a sectional view on the line 2,-2 of Fig. l, looking to the left, and shows the hinges and clips more fully described hereinafter. Fig. 3 is a sectional View on line 3 3 of Fig. 1 looking to the-left- Fig. 4 is a View similar to Fig. 2

with the exception that the segments are shown in a collapsed position. l

A is a cylindrical tube of steel, cast iron, or other suitable material which is divided longitudinally to form sections or segments which may be of any number or size, but preferably constructed as shown, there being three A1, A2, A3, one A.l having-a substantially semi-circular cross section, the others A2, A3 forming the remainder of the circumference-F Upon the inside of the semi-circular segment AIL-are located a. number of.

hinges- B which serve to pivotally attach the segments A2 and A3 to A.

The hinges B are preferably constructed Specification of Letters Patent.

Patented Sept. 29, 1908.

double as shown, each having a middle leaf Bl and two anking leaves B2 and B3, the joints inthe hinges being located at the edges of the semi-circular segment A1. The'segments A2 and A3 are beveled as shown in Figs. 2, 3, and 4, to enable the 'segment A2 to move inward past thev segment A3 when it is desired to remove a completed tube from oii the cylinder. l

C are clips or springs that perform the function of drawing the-segment A3 inward when the segment A2 is operated by means to be subsequently described.

To support the'cylinder, heads .D are provided, each having a fiange D1 which serves the dual purpose of centering the segmental cylinder while the softened web is beingA wound, and preventing the segments from opening outward. Adjacent to the heads and rigidly attached to the segment A1 are two brackets E provided with bearings E1 which prevent the shaft from becoming displaced when the heads D are removed.

D2 `are hubs to the heads that may serve as bearings for the mandrels.

In order that the segments A2 and A may be forcibl drawn inward away from the wound we eccentrics F are provided' which are rigidly mounted on the shaft G ournaled in the hubs D2. Each eccentric has an eccentric strap F1 which pivotally connects it by the pin F2 to the lug F3 mounted on the segment A2.

The o eration of niy invention is as follows z-'I e mandrel being set up as shown in Fig. l with a completed tube on the cylinder A, the shaft G is rotated by any suitable the l means such vas a crank causing the eccentrics and straps to draw the segment A2 and by means of the clips O the segment A3 inward toward the shaft, thus loosening the tube from the surface of the cylinder A. rlhe heads l) may then be removed and the tube drawn off the cylinder.

'While I have described my invention as comprising three segments and have' shown three eccentrics as the means for operating them, I do not wish to limit myself to that number ot segments or to that specific means for o erating them, as it is apparent that any num' er of segments may be used and that any operating means may be employed without departing from the sniritoi my invention.

Vf hat I desire to secure by Letters Patent l. In a mandrel of the character speciiied, the combination of a collapsible cylinder, a removable head to said cylinder having a flange projecting over the end thereof, said head forming in part one of the bearings for said cylinder, and means for collapsing the cylinder whereupon said head may be removed.

2. In a mandrel of the character speci'iied, the combination of a collapsible cylinder, bearings therefor, a shaft mounted in said bearings, and means connecting with the uncollapsiblo portion of said cylinder and providing an auxiliary support for said shaft vfor retaining the same in proper position upon the removal of its said mounting.

3. In a mandrel of the character specified,

the combination with a collapsible cyliii'd'ez@ of bearings therefor, a shaft mounted in said 4. In a mandrel 'of the kind described, a4

collapsible cylinder comprising two pivotally mounted inwardly swinging segments, a shaft concentricaliy located in said cylinder having eccentrics provided with eccentric straps, said straps being pivotally connected to one oi said segments, and means connecting the two segments to swing them inwardly simultaneously.

THORVALD HANSEN.

In presence of- GEORGE OQG. COALE,

M. E. FLAnEn'rr. 

